flash mob

or flash·mob

a group of people mobilized by social media to meet in a public place for the purpose of doing an unusual or entertaining activity of short duration: The flash mob brought wide smiles to the faces of commuters waiting for their train.

a group of teenagers who have contacted each other by cell phone and social media and gather in an area to trash it or to mug and beat passersby.

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verb (used with object),flash mobbed,flash mob·bing.

to crowd around (a place or person) in a flash mob: Dancing teenagers flash mobbed the store.

to commit violence against (a place or person) in a flash mob: The mayor imposed a curfew on all males under the age of 18 after two blocks of downtown Philadelphia were flash mobbed and severely damaged.